Wolbach, W.S., Ballard, J.P., Mayewski, P.A., Parnell, A.C., Cahill, N., Adedeji, V., Bunch, T.E., Domínguez- Vázquez, G., Erlandson, J.M., Firestone, R.B., French, T.A., Howard, G., Israde-Alcántara, I., Johnson, J.R., Kimbel, D., Kinzie, C.R., Kurbatov, A., Kletetschka, G., LeCompte, M.A., Mahaney, W.C., Melott, A.L., Mitra, S., Maiorana-Boutilier, A., Moore, C.R., Napier, W.M., Parlier, J., Tankersley, K.B., Thomas, B.C., Wittke, J.H., West, A., Kennett, J.P., 2018. Extraordinary biomass-burning episode and impact winter triggered ∼ by the Younger Dryas cosmic impact 12,800 years ago. 2. Lake, marine, and terrestrial sediments. The Journal of Geology 126, 185-205.

Hou, H., Shao, L., Tang, Y., Zhao, S., Yuan, Y., Li, Y., Mu, G., Zhou, Y., Liang, G., Zhang, J., 2020. Quantitative characterization of low-rank coal reservoirs in the southern Junggar Basin, NWChina: Implications for pore structure evolution around the first coalification jump. Marine and Petroleum Geology 113, 104165.

http://www.sciencedirect.com/science/article/pii/S0264817219306178 The assessment of coalbed methane (CBM) reservoirs can provide insights into the evolution of the pore structure systems around the first coalification jump (FCJ). The southern Junggar Basin, a typical low-rank coal-bearing basin in northwestern China, has been of interest to scientists and policy-makers due to its abundance of CBM resources and favourable conditions for CBM enrichment. A total of 28 coal samples from the Middle Jurassic Xishanyao Formation collected from 11 sampling sites in the central segment of the southern Junggar Basin were analyzed in this study. These samples were quantitatively characterized and comprehensively evaluated using macroscopic to nanometer-scale methods including macroscopic coal description, proximate analysis, vitrinite reflectance measurements, maceral analysis, low pressure nitrogen adsorption (LPNA), scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and nuclear magnetic resonance (NMR). The results show that the Xishanyao low-rank coals are characterized by low moisture contents, low or low-medium ash yields (eastern and western parts), high volatile matter contents, moderate vitrinite contents, and high inertinite contents. The physical property of the Xishanyao coals generally displays heterogeneity, with the specific surface area, the total pore volume, the air permeability and the 2 - 3 - 3 3 transverse relaxation time (T ) ranging from 0.116 to 15.983 m /g, 0.461 × 10 to 13.37 × 10 cm /g, 0.001 to 2 - 6 2 151.66 mD (0.987 × 10 to 0.149 μm ) and 1.44 - 174.22 ms, respectively. A new parameter, namely micropore volume proportion per unit nano-meter, is proposed. Micropore and transition pore volume per nm, specific surface area, total pore volume, D and D (LPNA fractal dimension) all first increase, then decrease and N1 N2 finally increase with rising coal rank, while the maximum and minimum values of the maximum vitrinite reflectance (R ) occur at 0.58 - 0.59% and 0.65 - 0.66%. The boundary of R corresponding to the FCJ can o, max o, max be further defined from 0.5-0.6% to 0.58 - 0.59% based on the evolution of adsorption pore structures. Thus, pore structure parameters related to adsorption capacity are controlled predominantly by coal rank. In addition, tectonic deformation has a strong impact on seepage pore structure but only a slight impact on that of adsorption pore, which leads to an ambiguous correlation or a complex trend between mesopore, macropore content, D MIP (fractal dimension of MIP) and coal rank around the FCJ. This study reveals the complex variation of pore structure evolution of low-rank coals and the significant influence of the FCJ on physical properties of coalbed methane reservoirs.

Hu, Y., Cai, C., Pederson, C.L., Liu, D., Jiang, L., He, X., Shi, S., Immenhauser, A., 2020. Dolomitization history and porosity evolution of a giant, deeply buried Ediacaran gas field (Sichuan Basin, China). Precambrian Research 338, 105595.

http://www.sciencedirect.com/science/article/pii/S0301926819305029 The deeply buried (>7 km) upper Ediacaran (Sinian) Dengying Formation (ca. 551.1-541 Ma) in the Sichuan Basin, China, is the largest Precambrian dolostone gas reservoir worldwide. Gas exploration from the Dengying Formation, however, is hampered by a limited understanding of its complex dolomitization history and porosity evolution. New petrological, geochemical and petrophysical analyses were performed and are discussed here to develop a better understanding of the formation's complexities. Microbialite, d olo-grainstone, and crystalline dolostone lithologies from the platform margin have high primary porosities relative to dolo-mudstone and less common microbialite lithologies from the low-energy platform interior. Spatially-variable primary porosity was subsequently overprinted by meteoric dissolution and dolomitization, often inducing secondary porosity. The